Observational mailbox window



FIG. 1 is a perspective view of an observational mailbox window mounted on a mailbox;

FIG. 2 is an elevational side view thereof;

FIG. 3 is an elevational front view of the mailbox;

FIG. 4 is an elevational back view of the mailbox;

FIG. 5 is a bottom plan view of the mailbox; and,

FIG. 6 is an elevational view of an opposite side of the mailbox showing another observational mailbox window identical in design to the observational mailbox window of FIG. 2.

The broken line showing of a mailbox is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an observational mailbox window, as shown and described. 